/* index.css */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}

nav {
    margin-top: 20px;
}

nav button {
    background: none;
    border: 1px solid #ddd;
    padding: 8px 15px;
    margin: 0 5px;
    cursor: pointer;
    border-radius: 4px;
}

nav button:hover {
    background: #f5f5f5;
}

article {
    margin-bottom: 30px;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 5px;
}

footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #666;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    nav button {
        display: block;
        width: 100%;
        margin: 5px 0;
    }
}